A Hazmat call to a Manchester Kentucky Fried Chicken restaurant was determined to have been sparked by a hoax call, police said.

Firefighters were called to the restaurant on Hooksett Road because employees reported eye and skin irritation from a fire extinguisher. When emergency crews arrived, they found three employees disrobed outside of the building.

The employees told police that the restaurant got a call from someone claiming to be from corporate headquarters who asked them to test their fire suppression system. When they did and reported that they had chemicals from the extinguisher on their clothes, the caller told them they needed to take their clothes off.

The workers said they became suspicious when the caller then told them to urinate on each other.

Two officers were sent to a hospital for treatment from being exposed to chemicals inside the building, and two employees were also treated at a hospital. The third employee refused treatment.

Police said they are investigating the incident as a criminal matter. The restaurant was closed until health officials could determine that it was safe to re-open. KFC released a statement saying it was cooperating with the investigation.